Cooling device



Patented Jan. 27, 1925.

FRIEDRICH GREINER, OF"CANNA'STATTSTUTTGART, GERMANY.

COOLING DEVICE.

Application ined August 25;'1'924. "serir Nb"734,'i46.

" To allwiwm t may concern:

Be it known Vt-hat I,I*`RIEDRICH` GREINER, a' citizen of the German R-epublic, residing 1, ingdrawing. A.Figure l represents a sectionA at Cannstatt-Stuttgart, Germany, Teck# .strasse 35, have invented certain 'new' and'A useful Improvements Yin Cooling `Devices, of which the following is a specification.

This invention relates to devices for improving the cooling action in cast machine parts, particularly in such parts as cylinders of internal combustion engines.

For the purpose of ensuring a solid or dense casting, for instance in the case of engine cylinders, it is known to embed pieces of sheet metal or the like into the castings when casting them. However it has always been usual to allow these cast in pieces to extend at the most to the surface of the casting, but not beyond it.

Further it is known to cool cylinders of internal combustion engines by means of ribs constituted by pieces of sheet metal cast into the cylinder bodies at their circumference.

It has now been found that it is desirable to utilize the sheet metal pieces which have hitherto been used for ensuring density of cast-ing, for an additional purpose, namely improving the dissipation of heat. This is effected by departing from the procedure previously employed and allowing the sheet n'ietal pieces to project beyond the crosssection of the cast-ing in the form of ribs or the like. Such sheet metal pieces are preferably cast in at the points where the cross-sections of the material are such that, during the cooling of the casting in the mould, they can only give off their heat to the exterior slowly, that is to say they remain liquid for a longer time than is desirable and consequently, for well knownV reasons, frequently show formation of pipes.,l It is also precisely at these places that heat accumulates during the operation of the engine or other machine, and the prolongation of the cast-in pieces of sheet metal or the like, affords a suitable means for carrying away the heat which would otherwise accumulate.

In the case of cylinders of internal combustion engines, the cast-in pieces can be allowed to project into the hollow space of the cooling jacket, and by suitably bending the projecting portions, the heat-exchange surface can be increased to any desired extent.

"Iwo'constructions embodying the, device according tothe present invention are' 'illustrated by 'way ofiexample inthe accompanythroug'h thei'cylindevr axis: of `one halff'of a four-cylinder blockilf'Figure" 2 Aisl a-I sect-ion on the line 2 2 of Figure l. Figure 3 is a section on the line 3 3 of Figure 2. F igure 4; is a section at right angles t0 the axis of a cylinder cover intended for eX- ample. for crude oil engines.

Referring to Figures l to 3, in the middle between each two adjoining cylinders a and two adjoining 'Valve chambers b, the pieces c or d made of sheet iron are cast in during the casting of the cylinder block. During the cast-ing operation they take up, at the places which otherwise cool slowly, those quantities of heat which otherwise would maintain the cast iron liquid for too long a period at the places in question, and partly owing to the said action, and partly owing to their own physical and chemical properties, they lead to the production in a reliable manner dense or compact casting. In accordance with the invention these cast-in pieces project beyond the cross section of the casting in the form of ribs, preferably into the cooling chamber or into the chambers e traversed by the cooling water, so that during the working of the engine, they serve to carry away heat from those places where otherwise there would be insufficient provision for the elimination of heat.

Reference to Figure 3 shows how the castin intermediate sheets or plates allow' each conduit c of thel cooling jacket to be fav0urably utilized.

In the case of the cylinder cover of the cross section shown in Figure 4, the cast-in plates which carry away the heat are marked f. i

There are of course numerous other methods of utilizing the device according tothe present invention in addition to those indicated by the examples previously mentioned. The cast-in pieces could of course be allowed to project beyond the surface of the casting, and be utilized also for air cooling or other kinds of cooling. By suitably bending, corrugating, rolling up andthe like, the projecting portions, their heat-carrying away surface could be increased to any desired extent; further they could themselves be formed into conduits or tubes for the passof a,

age of. a cooling medium, or conversely, tubes or the like traversed ,byl a cooling lnedium could be cast 'in or cast on the casting, if necessary by ineans of projecting ribs, lugs or the like. v

The invention is applicable not only to internal combustion engines, but to all such apparatus Where similar problems of carrying away hea-t arise. i

What I claim and desire to secure by Letters Patent of the United States is l. In a cast metal article, cooling ribs therefor consistingof the projecting portions of chill plates imbedded in the article at the casting` thereof.

2. In a cast metal article, a chill plate iinbedded in the` article at the castingthereof. said plate projecting beyond the surface of the article for forming a cooling rib therefor.

In an internal combustion engine cylinder casting` including a cooling` jacket, cooling` ribs for said casting formed by the extended portions of chill plates retained therein, said extended portions projeeting within said cooling jacket.

' FRIEDRICH GREINER.

l/Vitness H. C. TAYLOR. 

